Boozy Idea (слэш)

Setting: A good three years after the Battle of Hogwarts—After a few too many scotches, Harry, Severus, and Remus come up with an idea that magically binds them together for at least a year. And demands a few other things from them as well. (HPxSSxRL) What starts out as a joke and sounds like a bit of casual fun quickly turns into an emotional disaster in which the protagonists have to support one another.
There are a few chapters that are quite a tough read, especially at the start.